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ColorWell · contrast check

White or black text on #0a66c2?

LinkedIn blue

Use white text. It gives 5.69:1, which passes AA, not AAA.

White text
5.69:1
passes AA, not AAA
Black text
3.69:1
passes AA for large text only (18pt+/14pt bold)

What the thresholds mean

LevelNeedsWhite textBlack text
AA, normal text4.5:1passfail
AA, large text (18pt+/14pt bold)3:1passpass
AAA, normal text7:1failfail

If you need the other one to pass

Same hue, moved along the lightness ramp until the ratio clears AA.

The colour itself

Shade ramp

#c9f6ff #ace2ff #88c7ff #5ea7ff #2880e3 #1462b6 #00468b #002c63 #00133d

Paste this into your config

// tailwind.config.js
colors: {
  brand: {
    100: "#c9f6ff",
    200: "#ace2ff",
    300: "#88c7ff",
    400: "#5ea7ff",
    500: "#2880e3",
    600: "#1462b6",
    700: "#00468b",
    800: "#002c63",
    900: "#00133d",
  },
}

Text colour to pair with the 500 shade (#2880e3): black, at 5.29:1. For #0a66c2 itself it is white, at 5.69:1.

Your own colours, the same way

Paste any hex and get this page for it live — ratio, verdict, ramp. Export the whole palette to CSS variables, a Tailwind config or Figma tokens when you want it in the project rather than on the screen.

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